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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be258e510d410b7283a89001c9fc2355ab390421575e94ec44795f9d9517be7' 
  AND token = 'kekW9Q4PESIh2DwFC7fibE/d5i1yluOf4VcyL6RxjXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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