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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320db6bc5415ca10c2ace826270f9403d07a66acf27381b7beb827e03b596ff2' 
  AND token = '6C5ZgXPuH7eQabSe2C8N+QXQP+xJw5tqkTrnlbxlqSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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