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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47492e0933fe82b41c21d7c96aeaf406b59dc21b019a6f710a079cd5005fdfd7' 
  AND token = 'eN9Lag0v3Rg9b3/gJx94LKt0+6rZGjLcDrZWcrllSQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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