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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c7ddb87032426717c6356c8088e71be56e5f4415a6780108f2301592741757' 
  AND token = '4uGWq7mbXcIfFpkmJlj1wiTHG3hkotcO+haHPPD7LqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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