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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d2644346f5e836aa5c4bb529a977d2be9a3595d3379f63b489b9e2c0d31e1e' 
  AND token = 'gzPLKlYQTvT1lsX185CAnOjrsEcaXLmTwr+6rFk36Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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