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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d74096145b37348f80872f824da94ed21c3883e75739af46f9a1532c2aaabc' 
  AND token = 'geicR5TI3zP0C9QPv4JDkXEFp2eH9WkLxwi56wSZBTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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