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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc3f1fb3fa681ff38f95296a110f423e37a6c41fbc4163963b6b4d60d92e341' 
  AND token = '3cO+UzrTx76oxd1UW0A9OA1Sb1ovLf0KykHmMxhDHj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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