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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fc40c1792aa073846f1aca0acd4b714ebb8f49e4ba10292ff1fc463afd6c3a' 
  AND token = 'jGPJB3h9oHYpNzHkXhXz9Mo8iH6jIrqSqCJKT6Fff0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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