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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bdf4fd749ea2da0e476b4951bcdafcbc58d8d92ff37784b6eb0dd85c7dd78d' 
  AND token = 'vdgV4h+h76ZWkA3SttfIR86NvHtMn/+Un4+TmAqeHFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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