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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35718859b10ca570160c1497ca815a011737c98bb0255473f6e947778b981d38' 
  AND token = 'ZFWtZl0kfiFcHqaI2nDsqslZjR8Mr2vxLMnsrhUQdmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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