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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cee7ff708b5416a39848385f58f4f7e31412516fb48966b2ff37a43a2838130' 
  AND token = '/pg8GBJf0bmhz/ijfbC9VlLkUw4Oeri5yOzlSaydt/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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