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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a926973f8eda9ebac0784b53cda3cb45df7387e3bdaf83e72f3778f42dc099' 
  AND token = 'Qvi67vMjLAznHcnv9GD/CKhi4J6eONpISZ79lyWIczU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}