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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e875eae4557ab4f8a5bcb275c12e4abe4cbacedfce62c3ab8fcd4314cf20b2' 
  AND token = '+9mfHbov/D+Eq7qy7QzUZI49iLNq8IhwzvUzSsIreAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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