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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e884d4ee6c733dbff215444b8b35e4cf572e5db85b8dafd1638e34fc8bebfe3' 
  AND token = 'dvgdsiS5DdtnTK3/5nyttK9yPL/m89j356yBZWV7u1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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