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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c038bc5b537b6c3d3832a5630d89c56232953e1ca5e110bad319659c8e311b' 
  AND token = 'RUN8rcR+pSxAzt04Uags2Len1ApLa0bj+aS3nhME49M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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