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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2e354c9d0f1ba378445dad26ab14a30edcc6d8f11ec629434b16875e802a4f' 
  AND token = 'DTp9ARJudmV5C6AlsJ3RFl4mVHQNwtJ8DFWkUYgC8OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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