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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877cca403cbd3eb1ccac3484ab6c7482b9ed583ba4af01349c5067406818a195' 
  AND token = 'L5tlTSVKulSrWFZ55IPbKIZufPnpHS1kWxClYxeUc0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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