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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c70988085c1e475535181c079e53db59de476b44e69813970a9259daf337e87' 
  AND token = 'bqdLNSo1w79mNDv5DYIpV2Bx3TIoc8IfHn3QUwd86/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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