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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe6d2bfbc61c3b45019b8a79f97a7d7a17ecaee0cec110d826de072a27e04db' 
  AND token = '0tKzQ3TN/77Ja7oxWq7R7BE1OJG69vZu5qW+/adHM78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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