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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc95987cf6994021a0370a7208819dfd91bf8706090375c0c630a478b14cc79' 
  AND token = 'GjJqVc3AB0ExT6zlkrc9AS/KHiu1YbFmrVjMC8qu3i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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