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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a9ebeedf9b90dc2cfede661b4c8f212acdbc21fd93d9a4768bbd523baefd46' 
  AND token = 'ife3kPxIO9/hX1lksVh7Nwtd4DUGPskCZYwDEx/qJyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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