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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb971e29807910ec60c26c3ab8dd1321bad76b239f8de319f71c1bc7be6ca49' 
  AND token = 'jjajmgRXl9fn2Luzl7Eizl6lmrEtJSmH5quh/nyWxVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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