Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28eb09f97f5d132d35cbfca2c8fcf8d6008b8073cac632662a63c11be6aa9fcb' 
  AND token = 'OZ/ElUD9AM6Nd1J3XxGB+S0rd+PErC4bp1Qnk7c4DpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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