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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb9249b6973f658bcdf7c9329fc8b4a9ac94038ffd0f7c9d4a788bd73497c36' 
  AND token = 'x7cFLszYci0fEhHSNeJ6BgzH0tXRjYCZU5Np3Byi2ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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