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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95de4529d8e3eab105bb0efa997a6ed66e3c4c761368d017991cf61c5c34695c' 
  AND token = 'z+YldBzLAsQ9u9H4v3XTJoH82s042QkwzmBVvF1watE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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