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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de116f483f75a039e355466bbbf8cba223d8e4f205e389ecc23d3bdb1d8250fc' 
  AND token = 'mtA/TPxZjKXrX1ms69N851rWhxxa0ljpA3uqa1kxTIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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