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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e83e388677b5e87e6d485dd4de8cbd235d6abc9de497bfa34330339830cdc76' 
  AND token = 'CWH9WSRHNENmp3RQqhatZTzqD1PDS8e/0VPJV9ipIYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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