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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a95a6c79864213bba973895ee2737e71ba735e458799f8a7cb9be761dba7a4a' 
  AND token = '79BCk22eQk4seaYpNhmdS5q/gK7yjHqUfgmuCfBT35w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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