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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfc6e6a45ec932a655dc4d1d02971b9c9460e8e0a85171e9d9f48694a10ab15' 
  AND token = 'fYBeo7c+s6yGRzAZhYddNfP2z6FPrRMS4CaY9zqVpxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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