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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d12eefc9b14e1141436d873828606564661d862dfc07c0a4f761bd423c6b4e4' 
  AND token = 'As9XAgbgCevEZIEo8X1oI3ZZ0OgE2JzngdGFmi0Rzr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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