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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f96ed86dd9cf5135578c12d39397cff329edbdef308308cc2c57868c919ba3d' 
  AND token = '07rrTRG1VjQNPCcZYcT+/Jw7RYnHPy4Uyk1T5w/DbSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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