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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69755ff47895d1464fb5ffa6b25fd7c615701a9204297db082c4fb5ac1bfaf7e' 
  AND token = 'QPSiQWCi1iTMm9pmCZhJuTkr7uoSxg8KD+9lv0gImZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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