SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bccd978b93c0b31b2d6ad53f6a345c8036d8e6837378f5fc704c21a33163bf' 
  AND token = 'zmlJM5P1UKaU6WXVLIJUh6hvI1sLAcGXuBc6ZmuOmiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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