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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2dca223ffbce4948d91b88879b88b2a3b3a95af827dcf5bea30bbfe84e3d3a' 
  AND token = 'bPdhMYRxnOW4TQ5HoI63RNB1Z6NTZ41an3GFDrrI8Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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