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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ede3c7f432bd8757522c856d046e23b6dfaa77b271d9c37eeadb88c6d15c728' 
  AND token = 'gKvhoSE3Z0TidWF6tQiKhlKMFNmyrdC0q4JOx+I2vn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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