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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9085876e1d638ed162c41b30a16dbe32993a7b34c013cd7d2307207f9c90257' 
  AND token = 'OA3yzoND7QnGRx8G8RRoSzqelIokVFHNUJqd/pEZEzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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