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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7d58f92c02093ae64c06d15e3fee3d37e5de858ee109661420ccc0ebd19a68' 
  AND token = '1G1M23awb56oRx7NIlHtalIgZL7sSXsOkx50inLmHSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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