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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94c9209bfc8d5093c4f10245e9144be559738093ab988bcc640d183327166a1' 
  AND token = 'q4rbtBK29mhFSx07BAgUe4XFAGsNwRjpeMY7g20/suU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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