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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2798a96184265701529e9d3e1a82b1caec9812620086d53443b3a4bcc7a7fe0' 
  AND token = 'AfD8EZeOUpE0iHgnCHlqiaZxqYB4v5hl0rklc7q2Nvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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