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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9415c09457581f5388aa9dbca579d8ddb2a4e4a555b11be674414047c2af1be7' 
  AND token = 'pYJ+22tp4boQY4ryFlU8qJxfHQoIASiHCb9h4wZYNPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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