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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890cbd35b35e38e93d794fbf5cb03a0664973624b7762fc9f68b44be07287c69' 
  AND token = 'AmMR+esnd7xOG67mr2Ke8wXN0RQo5JhIJ9CQK+SOPWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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