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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14609c60aa77b8bbcd9b25baf0e06bb2bcb78deb9bdfa42f9b95c7e65e16353c' 
  AND token = 't96Yjt2G+NKb15vU2ubxtX9ewtugyzz9zKSZL79kxDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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