SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc2e3dea7dc24cc57d4da439f5df2bf1b1514ab0ca02543355161c7a7a1697e' 
  AND token = 'os2/BOxUJVCaj9U/ulQ5QbUYFRgK/FBqKhYIpBaYpPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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