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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d6e93c488093427f7dc245a339c2d562db55804035dbb1dba07e253ec797cf' 
  AND token = 'AIl6TV4G39CC9SE5mkvlUH4c0OA6NHhiRCb3rCAegDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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