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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a39c4ad9e0887307b1d29a7577d65bdaa4f99cb60d48cd1bc9ed4aa5834c45f' 
  AND token = 'hjW8oshjQo0QHqxasEFAQtckciQYar9tfg4h+xoseow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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