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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c872fa01cf67793ee3363f1bce35aadd08318e41450acbc9ccc06f3dae25def' 
  AND token = '7ITUmwEb9TmrJJcM0uZmQgSKfuZkLirs1n7FE/vdH7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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