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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5dac92fa011b4ff0884a9c74ddef45803464d5625b78ea3f127ba78ccce852' 
  AND token = 'dNO6f/9MnGWome9m7Mq1AWG7kmWIVgpOofuTeoac0e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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