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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73650f85f9f0e7c42a4b061c7cd3902e92fd2f151a5883c890f983774f2361a4' 
  AND token = 'I85uwWt8bR5W6ph5RfY8S90J8tv4b0XwGAwsSlBkhOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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