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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5cd3b1ae66848e26b3f4881a0df4347a435c73dd2aa0fc05ff00be3dc8b159' 
  AND token = 'Nn0DUxjA+Q/+5anN3eeRJBG+7Dvrvby2bkKRsu0ckgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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