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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4584edec0bd5d97d50ee41ff76271ab0b114622f1d751399f93e073f9d40d8' 
  AND token = 'xbg7Md+ftOyOFpIHZkjZbIWOTmJIWAsk0KNl0s9oBTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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