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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '970ba40a12334b6b1029f3f9efee2dbe4e4cd3c78ede5073af68cb1a7a3507c3' 
  AND token = 'DkdwrexGIl4978mOABgdiAg/i60c6oDtgnHm+RgaZyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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