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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4ec299303c96f54e45fafa2483518a5137c690e638d8286525a06cb6c01cf1' 
  AND token = 'dT6WQttE0zMyc4bSQs7+drX1L9ShUpJw9lyUQDJ5P4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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