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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a48736951d5b06771c6e9a919badff637b3b1ed514b820bf29c83bb4112661d' 
  AND token = 'aclb9x8LATBth2ZvdE7xiaUpf17BKJ451JamwiB0bOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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