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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed7a9c83b8fe7a17a96b74716f3177c7fefd6634bd529b1e6ce5d90fe894e7e' 
  AND token = 'vi8WHshvm2ILbMPwLfnOjGvZdx16LuiIvFRrBKRmKlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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