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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d05f7f327c9eb8bac0cbc34c158c184c2d17d6dd134221380ef14dad471f16' 
  AND token = 'TianaOOGdTZ3YkYa6/DFRlD2tnXnwrvBbvJ5rxr5/W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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