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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4cd180ce9e53fb48b15665e8870c9d492d00a7c779f2ee49503503e17184e8' 
  AND token = 'NvdZNY1xxVS+qcFXVqG0YoSheF/cN9IWs5ykXtoKUuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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