SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7832f0f48bc5666b92d3859b2dcd6dc5fb61bfdcf84bcce549774ac61e909e7a' 
  AND token = 'CphiE0Ci4gbC7XJTx/umxVBAMcxUh/l9h/MnzOvXPZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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