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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb56d737d48513831850dcd4e94ba885097950819a9b459a644e962bd7d07ac7' 
  AND token = '6zF/Az0PH7DTWjCrC/WZoyYVCE5xsCcWa8/29pgM+gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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