SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67637bc3270b4449c0248f9fb5f20028a30d5d0dea11f014931780e5a33c676d' 
  AND token = 'zsJHx7rwZYcB6s2vfFEIuNkxE1FB7lxpnXq/hMq9jJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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