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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf773104c077cd175792dfaffebdb27c0613f82a07a4b64cec46f47cecffb52' 
  AND token = '4kQqUxjdGxQAtMaYFcUU8VXdq/+1iTP/4+QDegMrSNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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