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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d973ec41a0cdb7d664d62a305fdbadeca463d3fb52cc8ca8379781ff6dad19' 
  AND token = 'MXl3FRAwv/PasSt3NWJcwU72PXddYDxSCJ/Xk+ZHoQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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