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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33eb88123ae4a55655d7b94825ee682992584230b7c2578737807ef49654df4' 
  AND token = 'bRcIQqYVxvJJ8/2WxaLdB6+o5Cjs3TmlWcwEoesh5RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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