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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ec42873df559626b70cb2918fe6737a092afe1cee3059395682f0e706b3587' 
  AND token = 'YhDVI91MBwcf4jQWrUzq+7v9uhS3LmOsUnYfuaT0L04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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