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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7dabf62422b4737e3bfc16eacef227c58ddd104c1057a8a12adc52a7a45a11' 
  AND token = 'vy5SS3gF01YiZw5nSWTVQwODk0K0Yphnwp25a/5yGMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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