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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc83f2b4e266efa2478c46f8e444cc05a5251d9bcddd97b89cef64a2d4404828' 
  AND token = 'vR4KGcogjdwAeqPs6AAwd4yNtwfxrCNEU3E9hUIv/HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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