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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3093ce534a45c7a328840841c87a05465dc01e41b08a3d725fac0bf15b35fd1d' 
  AND token = '0dMjuByffSqPmLZuFUpo93rozvGQvqblEmoQPbksj/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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