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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa2343205434f885c1e5051ecb2a9abec403c449b564ce4c68c4fc73851ee78' 
  AND token = 'TjDj+mAzzwq9ALgJoCBJ4m+OqXwjnNu8cCDJay+Q2JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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