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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8204522d70bafa081e7d62b7b01a18af4d36596eda2daeee33ef31a6c792a078' 
  AND token = '06W6QCGFcYsIWg8xfYFsXSEGs9rVVeozvYKy251docs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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