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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b82c616b1f3c76d0a3a5a11a5fc545ce96abc36e76813f3cddc109aa52aa8b8' 
  AND token = 'PogYKmY7tX5oGWwXjOP4/cUFWrJHExXEPfjL3lOWo/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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