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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d7439e08c21aed523735d23b66e2d1317388347eedd7b8f2c1075d929f5dfa' 
  AND token = '5l9I8q67kiscdP8ovKXvQCs5yT+jCrNOqUuroH7vll8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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