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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc7fd678a6467c32944d7a16a74eb1dd38e080376465aa0bb61ee5f1dc8b573' 
  AND token = 'XH0qflHYok6oXnO+Y5hB4ObBhxLoUEPgMLNpMHRF5/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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