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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609ad1e6ac6e41e3d43e78bf8e0d760dd605a5167ed589a4b3d88918008358bb' 
  AND token = 'bS3URLcGcOacdPR5e49QI3WLLnPSv9GxkEzliEMQhO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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