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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '595e9814a913fea68a73c730d6df15b65989b61433f795b7c8562df3663dfceb' 
  AND token = 'Ue1T1M/b1GE/nlxbsZXIA/CAK5UNPmqRUO5vor5dV28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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