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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856552d82875fc02ea928024edb9cd123a20a2549c3d110f6a27d3e98a58de8c' 
  AND token = 'LybNzpAf2gABtRj5LvdHgxz36PWTSiu4vUahL/fsSDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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