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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339989e4b88e6aca89294cbf2ce22f37d050019d183b12543744e96524946356' 
  AND token = 'WjgsUhoSoHvrizbOCir06S0NXrEflObB6bj5FXwgFC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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