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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87d9f002767fd9a3c2404ff40cc3d4af944dccf04b2fbe4d6e4a5a1fec67c66' 
  AND token = 'WgsSDcaVKJYrYM7pDQnxBCGtkdldez5itnIebXDPxbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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