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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fd26b9941a9491c6c83eab882a1b34b3459085976c247278914e1283b37ba0' 
  AND token = '9F6BDbOP6S3mXdMzPGU37NSU5uf46n5lHy+x9Lhg5/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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