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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5d28d570e873f7bbe26a6a614c2d85070a937a53b56daddc3e5403a520d4b3' 
  AND token = 'pCmSow954kbEQ/frckuXDpfm9wDx87mmS2C/bSsHD9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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