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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddf0b8929d6dd97f3305ebf2652e4c9a8992f438eb3de5bd944ecb9826f2684' 
  AND token = 'AyTTBtQdXFmOxnJq/QAx3Zk1mS2dRljm9EVwoci2O4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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