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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9a11c89dd3da252e8c4e5761c0537dfb98493dca09c821cb8e00a3d843dacd' 
  AND token = '3GwV2yiGwweXhz9RzlqneX5o/QToUU94pgY2ruok/Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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