SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f465d81e5730ffad0269131f758868eb4fcaf914df47d335952a206ff864c68' 
  AND token = 'Z5AYUQdQ1pXJ7xi4wqEd+CYa36KGKy/LHGUyqpv+Bng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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