SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885ed0bcb99313cc52db91c13da9a7b376f6f4325a343652cbe9494d15b63bad' 
  AND token = 'GOp9ubkca4JrkOO4ZP4Z+ZDP5qU/yqsDZ8WKANH59oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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